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7. Molar - What mass of sodium chloride (NaCl) is needed to make 250 mL of 0.75 M NaCl solution? Describe how the solution is prepared. Na = 23, Cl = 35.5 (3.5 pts.)

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Deanna Hettinger
Deanna HettingerLv2
17 Jun 2018
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Related questions

A. Molar Solutions: A molar (M) solution is define as a mole of a compound dissolved in enough water to make exactly one liter of solution at 200 C. A mole is the molecular weight of a compound in grams (g), e.g. for sodium chloride, it is 22.99 g (atomic weight of sodium) + 35.46 g (atomic weight of chlorine) = 58.45 g. Dissolve 58.45 g of NaCl in 1 liter (1 L) of solution = 1 molar (M) solution. You could also make up the same molarity of NaCl by dissolving 5.845 g NaCl in 100 milliliter (mL) or 0.5845 g in 10 mL or 0.05845 g in 1 mL. To make up lesser concentrations, say 0.1 M, you would add 5.845 g NaCl in 1 liter (L) solution or 0.5845 in 100 mL or 0.05845 g in 10 mL or 0.005845 g. in 1 mL. The metric sytstem is also useful in solutions too: 1 molar (M) is the same as 1,000 millimolar (mM) or 1,000,000 micromolar (mircolitersM) or 1,000,000,000 nanomolar (nM). Answer the following questions on a separate piece of paper for your lab report. Use correct scientific notation and significant figures:

6. Exercise: Explain how you would make 1000 mL of a 0.25 M solution containing sucrose (C12H22O11 ).

7: Explain how you would make up 200 mL of 0.25 M solution containing glucose using solid sucrose and distilled water,

8. Explain how you would make up 200 mL of 0.025 M solution containing glucose using solid sucrose and distilled water.

9. What is the concentration in 8 expressed as mM?

10. What is the concentration in 8 expressed as microlitersM?

11. What is the concentration in 8 expressed as nM?

% Mass/Volume - What mass of sucrose is needed to make 200 mL of a 5% sucrose solution? Describe how the solution is prepared. (3 pts.)

3. You have a 5 M NaCl stock solution. (NaCl F.W. is 58.4)

a) How much NaCl (in g) do you need to make 1 liter of the 5 M stock solution?

b) How much stock solution will you need if you want to make 100 ml of 50 mM NaCl?

c) What is the % concentration of a 50 mM solution of NaCl?

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